An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host.
Part of the Andes mountain range, Aconcagua is the second highest of the Seven Summits, behind only Mount Everest in Asia. At 22,837 feet (6,961 meters), not only is it the highest mountain in South America, it is the tallest peak in all of the Americas as well as the Southern and Western Hemispheres.
Oh, yeah, so the highest free-standing mountain in the world is Mount Kilimanjaro in Africa, at 19,341 (5,895 m.) feet above sea level (ASL). Free-standing means it stands alone and is not part of a mountain range. Usually these are volcanic mountains. The tallest mountain when measured from its base is Mauna Kea in Hawaii, at over 33,000 feet (10,058 m.)-- however its base is many miles below the ocean surface, and only 13,796 feet (4,205 m.) of that is above sea level!